Essay on Safety: Mineral and Gravity Separation

Submitted By Ebrahim1344

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Pages: 9

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Rock Classification
Strength
Classification

Strength range
MPa

Typical Rock types

Very weak

10-20

Weathered and weakly- compacted sedimentary rocks

Weak

20-40

Weakly cemented sedimentary rocks

Medium

40-80

Competent sedimentary rocks and some igneous rocks

Strong

80-160

Competent igneous rocks, some metamorphic rock

Very Strong

160-320

Quartzite family

Separation Techniques

Ebrahim Hosseini (PhD)

Mineral Characteristics
•
•
•
•
•
•
•

Density
Size
Colour
Magnetic and electrostatic
Physico-chemical
Chemical
Melting point

Liberation

Colour-Based Separation

Colour-Based Separation
1: Material feed
2: Vibratory feeder
3: Free fall acceleration 4: Line scan camera(s)
5: Data processing
6: Air pressure valves
7:Accept & Reject stream 8: central control

Density based Separation Techniques
• It is used to separate many different minerals from gangues such as iron ore, gold, tungsten, coal, tin and almost all larger size minerals.

• This method is simple and cheaper.
• In most cases, there is at least one stage of concentration by gravity method in each processing plant. • It is applied to broad range of particle size.

Separation Criterion
• In order for separation to be effective, there must be a marked difference in densities between valuable and non-valuable minerals. The separation criteria will give an idea as to the effectiveness of the separation:

S

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